Yes, PowerPets is a free website that is open to all. However, there are certain items and features that are easier to access if you purchase Power Credits with real money.
You can send a PMail to one of the staff members (such as -SC-) that you no longer wish to play on PowerPets and they can dismantle your account.
The PowerPets staff do not maintain a bank of passwords, so if you forgot yours you will need to have your password reset. There are instructions on the sign in page for this.
You can't.
Fireglass angel.
Do the Dark Guardian quest
Randomly, by compleating the sharkfather quest
by dropping items at dumpster from PF.
A fireglass angel.
This is not yet a feature on PowerPets, current to September 2011.
I suggest PowerPets. To "upgrade" your account, you need email and real money, but you don't have to upgrade. ;) I'm still pretty new to PowerPets myself, but it's a pretty cool website. :)
Food purchased from Shark-o-Bell in Abyss.
It turns into a snowman mini Glad to help.